Slide-valve for steam-engines



nUNITED STATES PATENT OFFICE.

ASTLEY C. ANCONA, OF READING, PENNSYLVANIA.

SLIDE-VALVE FOR STEAM-ENGINES.

Specification of Letters Patent No. 25,477, dated September 20, 1859.

T o all whom it may concern:

Be it known that I, ASTL'EY O. ANCONA, of the city of Reading, in t-he county of Berks and State of Pennsylvania, have invented a new and useful Improvement in Reciprocating-Valve Seats; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying' drawings and to the letters of reference marked thereon.

The nature of my invention consists in act the pressure of steam on top of the valve and also for the purpose of keeping the underside of the valve and thereby counteract the pressure of steam on top of the valve and also for the purpose of keeping` the valve and its seat at all times well lubricated.

In reference to the drawings similar letters refer to similar parts.

Figure l, represents a perspective view of the valve seat and corrugations therein. Fig. 2, represents a perspective view of the face of the valve and cavities therein. Fig. 3, represents an end view of the valve seat with the valve upon it, showing how the steam communicates with the corrugations a, c, a, a, not cut entirely across the seat.

To enable others skilled in the art to make and use my invention, I will proceed to describeits construction and operation.

My improvement consists in a valve and valve seat similar in every respect to the reciprocating valve seats generally used, eX- cept the corrugations a, a, a, a, and Z), Z), b, b, b, in the valve seat, and the small cavities c, c, c, c, Fig. 2, in the face of the valve. The corrugations a, a, a, a, and Z), Z1, L,

are cut from one fourth to half an inch in depth and occupy about one half of the area of the valve seat, so that when steam is admitted into the steam chest it occupies the space within said corrugations, and thereby counteracts the pressure of steam upon top of the valve, and at the same time keeps the faces of the valve and valve seat at all times well lubricated, thus preventing said faces from wearing irregularly by means of the equal distribution of steam and lubricating matter within the corrugations. The corrugations a, a, a, a, Fig. l, are not cut entirely across the seat, still there is a steam communication with them whenever the bearing surface E, E, Fig. 2, of the valve covers them, by means of the cavities or recesses c, c, c, c, in the face of the valve E, E, and are non-communicative whenever the cavity D, of the valve covers either of them, thus preventing the escape of steam whenever said cavity D, is over them which otherwise would be the case.

Fig. 3, represents an end view of the valve seat with the valve upon it, showing a position of the valve in which steam is communicated to the corrugations c, a, by means of the cavities c, c, in the valve.

IVhat I claim as my invention and desire to secure by Letters Patent, is-

The corrugated valve seat in combination with the cavities c, c, c, c, in the .face of the valve, substantially the same as and for the purposes herein set forth.

A. C. ANCONA.

Vitnesses MATTHIAS MENGEL, W'M. KEEN. 

